三元运算
材料科学
有机太阳能电池
富勒烯
接受者
聚合物太阳能电池
聚合物
高分子化学
有机化学
复合材料
化学
计算机科学
凝聚态物理
物理
程序设计语言
作者
Jicheng Yi,Man Pan,Lu Chen,Yuzhong Chen,Indunil Angunawela,Siwei Luo,Ting Zhang,An‐Ping Zeng,Jian Chen,Zhenyu Qi,Yu Han,Wei Liu,Joshua Yuk Lin Lai,Ha Kyung Kim,Xia Zhu,Harald Ade,Haoran Lin,He Yan
标识
DOI:10.1002/aenm.202201850
摘要
Abstract In the field of non‐fullerene organic solar cells (OSCs), most of the promising polymer donors are based on benzo[1,2‐b:4,5‐b′]dithiophene (BDT) units while benzo[1,2‐b:4,5‐b′]difuran (BDF)‐based polymers have drawn less attention since the efficiencies of BDF polymer‐based devices are generally lower than those of BDT polymer‐based ones. In this contribution, the BDT unit in a polymer donor named D18 is replaced with a BDF unit, and a new polymer named D18‐Fu is synthesized. As a highly‐crystalline molecule named Y6‐1O is chosen as the acceptor, the efficiency of binary devices based on D18‐Fu can reach 16.38%. Furthermore, when one of fullerene derivatives PC 71 BM is added, the ternary devices based on D18‐Fu achieve an efficiency of 17.07% and a high fill factor (FF) of 80.4%, both of which are the highest values among those of BDF polymer‐based devices. For comparison, D18‐based ternary devices show an inferior efficiency of 15.61% mainly due to the lower FF of 73.9%. Subsequent characterization reveals that D18‐Fu possesses a more coplanar molecular geometry, leading to better morphology and higher charge mobility for a promising FF. The high performance shown in this work demonstrates the potential role of BDF units in the design of polymer donors for highly efficient OSCs.
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